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From: David F. Skoll on 7 May 2008 15:00
Grant Taylor wrote:

> Rather than trying to identify gray listing (however you go about it)
> would be to have a back out in your queue retry times. I.e retry 15
> minutes, 30 minutes, 1 hour, 2 hours, and finally 4 hours after the
> failed delivery attempts.

Does Sendmail have support for backoff of queue retries? I don't believe
it does. The only way I've managed to do this is with cron and qtool.pl
hackery.

I used to run my queue every 10 minutes, but I had a cron job that moved
messages that had been attempted at least 10 times into a slower queue
that only ran every 4 hours.

I don't use that any more because I set up a FallbackMX host and don't
worry about it.

Regards,

David.
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